If you get the password wrong you can reset via email. If you get the email wrong - then you're stuck.
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Stewart DeanFeb 10 '14 at 14:53

@StewartDean If you get the email wrong, you can register again. The problem is that Facebook does not check the email you entered.
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kinokijufFeb 10 '14 at 15:00

@kinokijuf Facebook does check the email you entered, by sending an email with a link you must click on. This is the only sane way of ensuring that an email address both exists and is controlled by someone who is complicit in the creation of this Facebook account.
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Paul GregoryFeb 10 '14 at 16:15

@PaulGregory you can still register and use the site without activation. After several days, they issue you a “checkpoint” and demand you give them your phone number regardless of whether you have activated, but that’s another issue altogether.
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kinokijufFeb 10 '14 at 16:27

1 Answer
1

A similar question was asked on Quora. As @stewart-dean stated in an earlier comment, the primary reason seems to be that it helps to verify that a user entered their email address correctly. Passwords can always be reset. Incorrect email addresses cannot.

@kinokijuf come on, the informations he is referring to are available even if you're not logged.
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GabinFeb 10 '14 at 18:41

1

I don't personally think it's worth the -1 - but Quora doesn't let you see the material without logging in.
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adrianhFeb 11 '14 at 8:34

@kinokijuf There's a wall, but no pay, and Hynes has summarised the information there. Would you rather Hynes didn't link directly to it, meaning that as well as having to log in you had to find the question?
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Paul GregoryFeb 11 '14 at 17:14